Can you tell me where I can find the headshot number for this player on this specific report? Normally I see it next to number of kills, but not here. 

http://battlelog.battlefield.com/bf4/battlereport/show/1/868363703202833664/1753563719/

You need to count the amount of headshot ribbons, then multiply those with 2. That gives the minimal amount of headshot the player made in that game.

Only the person who made the most headshots in a game has the exact amount of headshots shown next to his name.